Something a bit odd, with my MvC2 CD.

[Ludacris]

OK, my friend got me a copy of Marvel vs Capcom 2 on a CD-R disc. I can make an exact copy of this game just fine. But if I take all the files on the CD put them on my harddrive and then try to burn it again the CD doesn't work on my DC. I don't need a Utopia Boot CD, the game is self booting, can anyone just explain to me why I can't take the files off the CD to my harddrive and then reburn it?